Block signals except during the event loop. Closes:#692233.

Previously we would interrupt whatever we were doing, willy-nilly.
Now we wait until the event loop is reentered.  Symptoms could include
locking up the server with a grab, and/or spinning on the cpu.

This patch is not very portable (it uses ppoll) but I think it will
work on all Debian architectures.

In the longer term we should update to new upstream, where the last
commits were in 2013.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

1 files changed, 4 insertions, 0 deletions

diff --git a/events.h b/events.h
index 8d42304..6c447df 100644
--- a/events.h
+++ b/events.h
@@ -77,6 +77,10 @@ extern void InstallWindowColormaps();
 extern void RedoDoorName(); /* djhjr - 2/28/99 */
 extern void RedoListWindow(); /* djhjr - 3/1/99 */
 
+extern void BlockSignalsAddToList();
+extern void BlockSignals();
+extern void UnblockSignals();
+
 extern event_proc EventHandler[];
 extern Window DragWindow;
 extern int origDragX;